[23]

Cassia calliantha

Sept 16-18th 1877

Traced movements of one of the 2 terminal leaflets on vertical glass, at distances of 155 mm from leaf — a pointed card being at distance of 210 mm. from glass.

The point of card & end of leaflet formed a slightly oblique line. The leaflet was turned directly from the front of House & was chiefly illuminated through glass roof — It does not appear that the lateral movement to West by N. (?) every morning could have been influenced by light.— The broken lines show amt of movement during the night; in the interval of observation, the distance not being traced observed.

It is evident from diagram that the great movement is downwards late in evening & during early night.— (on Sept 15th when the line drops most the observation was carried on to a later hour) & upwards during the latter part of night or early morning— The movement being always to the N.E.(?) end of Hothouse & in opposite direction during the night.— Every morning the leaf moved to S. W. (ascertain direction of Hot-House) but in a crooked course, sometimes rising & sometimes sinking. The odd triangle made during Left before 12° & 2'. 25' seemed to be due to sun having come out at this time, the day having been before cloudy. The lesser movement during the 17th, probably due to day colder.— The general movement on the successive days to the SW.? I presume owing to growth of leaf.